Long-Period Earthquakes 2 : Low-frequency earthquakes (called long-period or volcanic), which reflect adjustments related to the exit of magma from the summit reservoir to feed the eruption
Natural and Environmental Disaster Information Exchange System NEDIES, European Commission, Directorate General Joint Research Centre (DG JRC), Institute for the Protection and Security of the Citizen (IPSC), Ispra (Varese) Italy, http://nedies.jrc.it/index.asp?ID=82#Top, US Geological Survey (USGS), Earthquake Hazards Program, Glossary of Earthquake and Related Terminology, USGS/Cascades Volcano Observatory, Vancouver, Washington, Washington, USA 2012. http://vulcan.wr.usgs.gov/Glossary/Seismicity/eart hquake_terminology.html, (ND/ Erthq - Amer) {165}